package com.commerce.util;

import java.io.*;
import java.util.UUID;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;


public class Base64Img{

    //图片转化成base64字符串
    public static String GetImageStr()  
    {//将图片文件转化为字节数组字符串，并对其进行Base64编码处理  
        String imgFile = "d://test.jpg";//待处理的图片  
        InputStream in = null;  
        byte[] data = null;  
        //读取图片字节数组  
        try   
        {  
            in = new FileInputStream(imgFile);          
            data = new byte[in.available()];  
            in.read(data);  
            in.close();  
        }   
        catch (IOException e)   
        {  
            e.printStackTrace();  
        }  
        //对字节数组Base64编码  
        BASE64Encoder encoder = new BASE64Encoder();  
        return encoder.encode(data);//返回Base64编码过的字节数组字符串  
    }  
      
    //base64字符串转化成图片  
    public static boolean GenerateImage(String imgStr, String imgFilePath , String imgName)
    {   //对字节数组字符串进行Base64解码并生成图片  
        if (imgStr == null) //图像数据为空  
            return false;
        File file =  new File(imgFilePath);
        if( !file.isDirectory()){
            file.mkdirs();
        }
        BASE64Decoder decoder = new BASE64Decoder();  
        try   
        {  
            //Base64解码  
            byte[] b = decoder.decodeBuffer(imgStr);  
            for(int i=0;i<b.length;++i)  
            {  
                if(b[i]<0)  
                {//调整异常数据  
                    b[i]+=256;  
                }  
            }

            OutputStream out = new FileOutputStream(imgFilePath+imgName);
            out.write(b);  
            out.flush();  
            out.close();  
            return true;  
        }   
        catch (Exception e)   
        {
            e.printStackTrace();
            return false;  
        }  
    }

    /**
     * 上传图片
     * @param base64
     * @return
     */
    public static String uploadImg(String base64 ,String webuploadpath){
        String imgname=UUID.randomUUID().toString()+".jpg";
        if(!Base64Img.GenerateImage(base64.split(",")[1],webuploadpath+"/img/", imgname)){
            return null;
        }
        return "/img/"+imgname;
    }
}  